INTERNATIONAL STANDARD
Partialdischarge measurements High-voltagetesttechniques-
ThisEnglish-languageversionisderivedfromtheoriginal bilingualpublicationbyleavingoutallFrench-languagepages.Missing page numbers correspond to theFrench-language pages.
INTERNATIONAL STANDARD
Partialdischargemeasurements High-voltage test techniques-
IEC 2000 Copyright - llrights reserved
No psrt of this pubicstion may be reproduced or utiized in any form or by any means electronic or mechanical. including photocopying and microfim without permission in writing from the publisher.
Intermafional Electrotechnicsl Commission 3 rue de Varembe PO Box 131 CH-1211 Geneva 20 SwitzerlandTelephone: 41 22 919 02 11 Telefax: 41 22 919 03 00 E-mail inmail@iec.ch Web:
CONTENTS
FOREWORD .9
Clause
1 Scope. Normative references. .. 15 132 3 Definitions. 154 Test circuits and measuring systems... 254.1 General requirements. 254.2 Test circuits for alternating voltages . . 27 254.3 Measuring systems for apparent charge 4.3.1 General. 274.3.2 Coupling device.. 274.3.3 of apparent charge. Pulse train response of instruments for the measurement .274.3.4 Wide-band PD instruments. .294.3.6 4.3.5 Wide-band PD instruments with active integrator Narrow-band PD instruments. .314.4 Requirements for measurements with digital PD-instruments . .314.4.1 Requirements for measurement of apparent charge q..4.5 Measuring systems for derived quantities... 4.4.2 Requirements for measurement of test voltage magnitude and phase 334.5.1 Coupling device.... .334.5.2 4.5.3 Instruments for the measurement of pulse repetition rate n.. Instruments for the measurement of average discharge current ...... 354.5.4 Instruments for the measurement of discharge power P. 354.5.5 Instruments for the measurement of quadratic rate D. .354.5.6 Ultra-wide-band instruments for PD detection. Instruments for the measurement of the radio disturbance voltage .35 375 Calibration of a measuring system in the plete test circuit. 375.1 General. .37Calibrators 5.2 Calibration procedure. .37 .396 6.1 General. 396.2 Calibrators for the calibration of a measuring system in the plete test circuit... 396.3 Calibrators for performance tests on measuring systems .. .41
Clause
PageMaintaining the characteristics of calibrators and measuring systems . 417.1 Schedule of tests .7.2 Maintaining the characteristics of calibrators .437.2.2 7.2.1 Routine tests on calibrators Type tests on calibrators ... .43 437.2.3 Performance tests on calibrators .....7.2.4 7.2.5 Performance checks on calibrators.... Record of performance.. .43 .457.3 Maintaining the characteristics of measuring systems. . 457.3.1 Type tests on PD measuring systems . ... 457.3.2 7.3.3 Performance tests on measuring systems.. Routine tests on measuring systems... .47 477.3.4 Performance checks for measuring systems. . 477.3.5 Checks for additional capabilities of digital measuring systems . ...498 Tests 7.3.6 Record of performance.. . 518.1 General requirements. .518.2 Choice of test procedure Conditioning of the test object .518.3 8.3.1 Determination of the partial discharge inception and extinction voltages.... 53 538.3.2 Determination of the partial discharge magnitude at a specified6 Measuring uncertainty and sensitivity.... test voltage .5310 Disturbances. . 5511 Partial discharge measurements during tests with direct voltage . 5711.1 General.. 5711.3 Voltages related to partial discharges. 11.2 Quantities related to partial discharges. .57 . 5711.3.1 Partial discharge inception and extinction voltages11.4 Test circuits and measuring systems. 11.3.2 Partial discharge test voltage. .59 .5911.5 Tests.... ..5911.5.1 Choice of test procedures. ...5911.5.2 Disturbances. .59Annex A (normative) Performance test on a calibrator.. .71 77Annex B (informative) Test circuits Annex C (informative) Measurements on cables gas insulated switchgear powercapacitors and on test objects with windings ...Annex D (informative) The use of radio disturbance (interference) meters for the detection of partial discharges.... .83Annex E (informative) Guidelines to digital acquisition of partial discharge quantities....Annex F (informative) Non-electrical methods of PD detection .. . 93Annex G (informative) Disturbances.. 95
Figure 1 - Basic partial discharge test circuits.. .63Figure 2 - Test circuit for measurement at a tapping of a bushing. . 65Figure 3 - Test circuit for measuring self-excited test objects. 65Figure 4 - Connections for the calibration of the plete test arrangement .69Figure 5 - Correct relationship between amplitude and frequency to minimize integration errors for a wide-band system..... 69Figure A.1 - Calibration of pulse calibrators. 75Figure D.1 - Variation of CISPR radio disturbance meter reading f(N) with repetitionfrequency N for constant pulses... Figure E.1 - Output voltage signals Uout of two different PD measuring systems ...85for apparent charge (double pulse) 91Table 1 - Pulse train response of PD instruments. Table 2 - Tests required for calibrators. 29 45Table 3 - Tests required for measuring systems 49
